Our new Developer’s plan is designed to allow you to take all the time you need to integrate with our API. Our endpoint will parse your request, validate your JSON, process uploads, obey
callback_url option, etc. Everything will reflect production usage on a fully-featured Kraken API plan apart from the actual optimization process itself. Instead Kraken API will return randomized optimization results. For details see our documentation for the developer’s plan.
To use Developer’s plan simply sign up for one and Kraken will automatically detect your plan level.
— The Kraken Team